I really liked the way you built up to the accident slowly, detailing her meals and the effect of her muscle relaxant drugs. I was expecting the muscle relaxants to weaken her sphincter and cause an accident, I rather liked your approach however.
The only part of the story I felt was weak was the guard's dialog when he found her. Other than that, it was a wonderful read.
Very nice! I had almost forgotten that you were making your own MGS story. It's definately more elaborate than mine, and does offer more, conservative version of Wolf thatn the one I used. Of course, this being an 'origins' story, it does fit in quite nicely.
One of these days I should try and get back and do another MGS inspired story. I have actually, considered one using the girl from the second Metal Gear game, though I'm trying to figure out how it could work.